Update some Android astubx models

[msridhar]

Update SDKs 28-30 as our astubx format has changed. SDK 31 to come in a follow-up PR. Also add a minimal integration test to ensure things aren't completely broken (at least for one SDK model version, which typically should be the latest one).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.61%. Comparing base (69b8e4c) to head (c77c4a3).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1052      +/-   ##
============================================
+ Coverage     87.54%   87.61%   +0.07%     
  Complexity     2165     2165              
============================================
  Files            85       85              
  Lines          7114     7114              
  Branches       1386     1386              
============================================
+ Hits           6228     6233       +5     
+ Misses          458      452       -6     
- Partials        428      429       +1     

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